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I remember they found remnants of a 10k yr old ritual ground that matches the ritual in the oral tradition.

Found it https://www.nature.com/articles/s41562-024-01912-w

There is also a legend of incestuous royals connected to the Boyne valley tombs in Ireland, written down in the 12th century. DNA examination of a person buried in the tombs found that his parents were indeed very closely related. This suggests almost 5000 years of oral tradition, even surviving a fairly big cultural replacement event.

If that can happen, it's not so surprising a story can last 20-30000 years either - especially not if there's not much else making a similar impression to tell stories about.

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